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United States Patent | 6,172,651 |
Du | January 9, 2001 |
A low cost glass mount vehicle antenna system utilizes, in a preferred embodiment, an over-coupled quasi-TEM mode transmission line coupler having two simple stamped or printed plates stacked over an L shape internal ground plane. The two conductive plates are located on opposite sides of the glass. With proper open circuit terminations on two of the four coupler ports, the backwards and forward coupling signals are redirected/combined and are effectively fed diagonally between the other two ports, thereby achieving through-glass coupling. The over-coupling achieves this efficient through-glass coupling effect at two spaced-apart frequencies (e.g. 800 MHz and 1800 MHz). The coupler is of a low impedance type and can be used with a variety of collinear array and elevated-feed antennas. It features high efficiency, low backwards radiation, and mechanical simplicity.
Inventors: | Du; Xin (Bartlett, IL) |
Assignee: | Larsen Electronics, Inc. (Vancouver, WA) |
Appl. No.: | 951428 |
Filed: | October 16, 1997 |
Current U.S. Class: | 343/850; 333/109; 343/713; 343/715 |
Intern'l Class: | H01Q 001/50; H01Q 001/32 |
Field of Search: | 333/116,109,24 C 343/713,715,850 |
Re33743 | Nov., 1991 | Blaese. | |
2026652 | Jan., 1936 | Ponte. | |
2206820 | Jul., 1940 | Mydlil. | |
2559613 | Jul., 1951 | Halstead. | |
2829367 | Apr., 1958 | Rychlik. | |
3364487 | Jan., 1968 | Maheux. | |
3657652 | Apr., 1972 | Smith. | |
4001834 | Jan., 1977 | Smith. | |
4028704 | Jun., 1977 | Blass. | |
4089817 | May., 1978 | Kirkendall. | |
4238799 | Dec., 1980 | Parfitt. | |
4492939 | Jan., 1985 | Burns | 333/116. |
4621243 | Nov., 1986 | Harada. | |
4658259 | Apr., 1987 | Blaese. | |
4692770 | Sep., 1987 | Kadokura. | |
4764773 | Aug., 1988 | Larsen et al. | |
4779098 | Oct., 1988 | Blaese. | |
4785305 | Nov., 1988 | Shyu. | |
4794319 | Dec., 1988 | Shimazaki. | |
4804969 | Feb., 1989 | Blaese. | |
4825217 | Apr., 1989 | Choi. | |
4839660 | Jun., 1989 | Hadzoglu. | |
4850035 | Jul., 1989 | Schiller. | |
4857939 | Aug., 1989 | Shimazaki. | |
4862183 | Aug., 1989 | Blaese. | |
4872630 | Oct., 1989 | Cooper. | |
4931806 | Jun., 1990 | Wunderlich | 343/715. |
4939484 | Jul., 1990 | Harada. | |
4939524 | Jul., 1990 | Blasese. | |
4992800 | Feb., 1991 | Parfitt. | |
5017934 | May., 1991 | Blaese. | |
5023622 | Jun., 1991 | Blaese. | |
5027128 | Jun., 1991 | Blaese. | |
5041838 | Aug., 1991 | Liimatainen et al. | |
5059971 | Oct., 1991 | Blaese. | |
5099252 | Mar., 1992 | Bryant et al. | |
5451966 | Sep., 1995 | Du et al. | |
5471222 | Nov., 1995 | Du. | |
5557290 | Sep., 1996 | Watanabe | 343/713. |
5565877 | Oct., 1996 | Du et al. | 343/713. |
5742255 | Apr., 1998 | Afendras | 343/713. |
5841328 | Nov., 1998 | Hayashi | 333/116. |
Foreign Patent Documents | |||
3537107 | Oct., 1985 | DE. | |
458 592 A2 | Nov., 1991 | EP. | |
1203227 | Aug., 1958 | FR. | |
1227757 | Jun., 1959 | FR. | |
1-36128 | Feb., 1989 | JP. | |
1-77230 | Mar., 1989 | JP. | |
6303016 | Oct., 1994 | JP. |
Fink, Electronics Engineers' Handbook, McGraw-Hill Book Company, 1.sup.st Ed., 1975, p. 3-3. Johnson, Transmission Lines and Networks, McGraw-Hill Book Company, 1950, p. 239. Ora Electronics brochure, "Static Noise and Cross Talk When Using Your Portable Cellular Telephone Inside a Car?" 1990. Ora Electronics, "Passave Repeater for Portable Cellular Telephones," 1990, 5 page publication. dbMobile Brochure, "Active Link Repeater Installation Manual," 1992, 14 pages. Gianola et al., "General Computation of Co-Polar and Cross-Polar Components of Arbitrary Aperture Coupled Multilayered Microstrip Antennas," Antennas and Propagation, Apr. 4-7, 1995, Conference Publication No. 407, pp. 29-33, IEEE 1995. Kamiya, et al., "Design for Dual-Frequency Microstrip Antenna Using Annular Slot Aperture Coupling," 91/CH3036-1/0000-1118, pp. 1118-1121, IEEE 1991. Ikrath, et al., "Slot-Coupled Vehicles (Trucks, Tanks, and Jeeps) Performing as VHF Antennas," Communications/Automatic Data Processing Laboratory, U.S. Army Electronics Command, Fort Monmouth, NJ, Ap-S Session 12, 0940, pp. 387-390. Pozar, "Improved Coupling for Aperture Coupled Microstrip Antennas," Elec. Lett. 27, pp. 1129-1131 (Jun. 1991). Saed, "Slot-Coupled Circular Microstrip Antenna Having a Symmetric Radiation Pattern," Department of Electrical Engineer, State University of New York, 0-7803-1246-5/93, pp. 1204-1206, IEEE 1993. Takeuchi, et al., "Characteristics of a Slot Coupled Microstrip Antenna Using High-Permittivity Feed Substrate," Electronics and Communications in Japan, Part 1, 78:3, pp. 85-94 (1995). |